Pt/Zr(x)-HMS/HZSM-5 catalysts with various Si/Zr ratios (as x) were used for investigation of the kinetics of n-heptane reforming process under 350 - 450 oC reaction temperature, 35 to 80 ml min-1 flowing rate of hydrogen and 2 to 5 ml h-1 flowing rate of n-heptane. In the present work, two kinetics (power law and Langmuir - Hinshelwood) models were selected and examined to describe the kinetic...

The occurrence of an S-shaped polarization curve in a simple model for the continuous electrochemical oxidation of CO on a platinum electrode is discussed. In the model, the S-shaped polarization curve is caused by the competitive Langmuir-Hinshelwood mechanism between surface-bonded CO and OH. The reaction is studied experimentally on single-crystal platinum rotating disk electrodes in perchlo...

In the present study, transalkylation of 1,4-diispropylbenzene (DIPB) with benzene in the presence of modified beta zeolite was performed to produce cumene in a fixed bed reactor. Beta zeolite was exchanged with cerium in order to modify its catalytic activity. Activity of the modified catalyst was evaluated in the range of temperature 493K–593K, space time 4.2 kg h/kmol–9.03 kg h/k mol and ben...

Dyes fouling of reverse osmosis (RO) membranes and its relation to adsorption had been investigated by using a crossflow RO filtration setup. Methylene blue (MB) and rhodamine B (RB) were used as model organic foulants. The calculated amount of the irreversible sorption was related to the irreversible flux decline. The characteristic fouling kinetics was accounted by Langmuir-Hinshelwood (L-H) ...

This study aimed to investigate the kinetics of anion exchange step ferrous ions with Na-X zeolite in a temperature range 20 and 80°C for period up 8 hours. A sulfate heptahydrate solution was used as ion source sodium zeolite. The results showed change physical appearance progress process. catalyst color observed time changed from yellow brown. exchanged contents increased reached 0.519 at aft...

Dispersion-corrected periodic DFT calculations have been applied to elucidate the Langmuir−Hinshelwood (dissociative) and an Eley− Rideal/Mars−van Krevelen (associative) mechanism for ammonia synthesis over Co3Mo3N surfaces, in the presence of surface defects. Comparison of the two distinct mechanisms clearly suggests that apart from the conventional dissociative mechanism, there is another mec...

Intrinsic nitrogen vacancies can become catalytic centers for the ammonia synthesis reaction on Ta3N5via a Langmuir–Hinshelwood mechanism. Dinitrogen is activated in peculiar side sandwich-like configuration between two surface Ta atoms.